Valve grinding device



June 11, 1963 1. gun I H. C. F'ORTIN VALVE GRINDING DEVICE Filed Nov. 21. 1960 Illlll w 7/4 Ila INVENTOR. HENRY C, FORT/N United States Patent 3,092,938 VALVE GRINDING DEVICE Henry C. Fortin, 189 /2 North St., Bristol, Conn. Filed Nov. 21, 1960, Ser. No. 70,837 2 Claims. (Cl. 51241) vThis invention relates to tools, and more particularly to a tool for permitting the refacing or grinding of the beveled surfaces of the valve and valve seat of an internal combustion engine without removing the valve from the cylinder head of said engine.

One object of the invention is to provide an adapter for connecting a motor driven shaft to the recessed valve head of an internal combustion engine for rotating said head against a strip of emery cloth held fixed upon the valve seat.

A further object of the invention is to provide a tool of the above nature which will be simple in construction, inexpensive to manufacture, easy to install and manipulate, compact, ornamental in appearance, and very efficient and durable in use.

With these and other objects in view, there has been illustrated on the accompanying drawing, one form in which the invention may conveniently be embodied in practice.

In the drawing:

FIG. 1 represents a side view in elevation of the adapter and drive shaft.

FIG. 2 is a top plan view of the same.

FIG. 3 is a bottom plan view of the same.

FIG. 4 is a side view on an enlarged scale, and partly in section, of the adapter as it appears when assembled to the valve head of an internal combustion engine and with a strip of folded emery cloth held in a fixed position upon the valve seat.

FIG. 5 is a perspective view, in exploded relation, of the drive shaft, the adapter, and the bottom U-shaped lock washer.

FIG. 6 is a fragmentary sectional view on an enlarged scale of the adapter disk and the drive shaft to which it is attached, with the large widely spaced drive studs extending downwardly for engaging the sockets in the top of an automobile engine valve head.

FIG. 7 is a side view, partly in section, of the adapter disk shown in inverted position with the closely spaced drive studs extending downwardly into the sockets of a small valve head, such as used in a power lawn mower, and with the emery cloth shown in fixed position with respect to the valve seat.

FIG. 8 is a side view, partly in section, on an enlarged scale, showing the position of a folded emery cloth prior to pushing the large depending drive studs downwardly to cause the emery cloth to rotate with the adapter for grinding the valve seat.

Referring now to the drawing, in which like reference numerals denote corresponding parts throughout the several views, the numeral 10 (FIGS. 4 and 8) indicates a Valve head of an internal combustion engine having an annular lower beveled face 11 and a depending valve stem 12. The valve stem 12 is located within a chamber 14 of a motor cylinder block 13, and is held in position by means of a valve stem guide 15.

The motor block 13 in the top of the chamber 14 is provided with a circular valve seat 16 having a bevel 17 against which the bevel 11 of the valve head 10 is adapted to seat. The numeral 18 indicates a folded emery cloth, preferably of 150 grit, which is adapted to be held stationary in the position shown in FIG. 4, by means of pliers P, or the operators hand, for causing the bevel 11 on the valve head 10 to be ground by means of a rotating reversible adapter disk 21 which is provided with a central hole 22 (FIG. 5), within which a shaft 23, which Patented June 11, 1963 may be detachably connected to an electric drill chuck C (FIG. 4), is loosely mounted.

The numeral 24 indicates a groove near the bottom of the drive shaft 23, within which a U-shaped lock washer 25 is adapted to be detachably mounted for bolding the reversible adapter disk 21 in position upon the drive shaft 23.

The numeral 26 indicates one end of a vertical drive pin passing through the adapter disk 21 and rigidly mounted therein, the opposite end of said drive pin being indicated by the numeral 26a.

In order to prevent relative rotation of the adapter disk 21 with respect to the shaft 23, said shaft is provided with a cross hole 27a located above the adapter disk 21, and within which is mounted a strong cotter pin 27 having an end loop 28 and an opposite pair of free diverging ends 29, 30.

Provision is also made of a pair of widely spaced relatively large vertical drive studs 31, 32 which are shown in FIGS. 1, 3 and 4 located beneath the adapter disk 21 for fitting within the shallow sockets 19, 20 (FIG. 4) in the top of the valve head on an automobile engine. The drive studs 31, 32 are provided with conical intermediate shoulders 33, 34 and have ends 35, 36 loosely seated in holes 35a, 36a in the adapter disk 21, the extremities of said ends being spun over upon said disk to form heads 35b, 36b.

Provision is also made of a pair of closely spaced small vertical drive studs 37, 38 which extend from the opposite side of the reversible adapter disk 21 from the large drive studs 31, 32. The small studs 37, 38 are adapted to engage within shallow sockets 19a, 20a of a valve head 10a of the engine of a power lawn mower or other small internal combustion engine.

Operation In the operation of the valve grinding tool, it is merely necessary to remove the cylinder head of the internal combustion engine to expose the valve head 10 or 1011 of the automobile engine or power lawn mower, as the case may be. The valve head will then be raised sufliciently from its seat to permit the insertion of the doubledover emery cloth 18 therebetween, and while holding said emery cloth rigidly against the valve seat 16, the electric chuck C will then be driven to cause the adapter disk 21 to rotate the valve head 10 with respect to the valve seat 16 and grind the bevel 11 of said head 10.

After the bevel on the valve head itself has been ground sufficiently, the adapter disk 21 will be raised above the position shown in "FIG. 8, and a new folded emery strip will be inserted in the angular position shown in said figure. The drive studs 31, 32 will then be depressed and forced through the emery cloth 18, whereby, when the adapter disk 21 is rotated, the emery cloth, which is located between the valve and the seat, will grind the valve seat 16, as clearly shown in FIG. 8.

By means of this construction, it will be unnecessary to remove the valve from the engine block for grinding or finishing the valve head and its seat, and this operation may be performed in several minutes as compared to sixty minutes or more in the previous practice.

While there has been disclosed in this specification one form in which the invention may be embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not limited to the specific disclosure, but may be modified and embodied in various other equivalent forms without departing from its spirit. In short, the invention includes all the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new and for which it is desired to secure Letters Patent is:

1. *In a valve head grinding device, the combination of an adapter disk having a detachable non-rotatable connection to a vertical power driven shaft, said disk having a pair of drive studs projecting at right angles from both sides thereof for detachably engaging in the shallow apertures in the :top of the valve head of an internal combustion engine, said disk also having a pin projecting therefrom, parallel to said drive studs for receiving the loop of a cotter pin secured to the end of said shaft above said disk, and a U-shaped lock Washer frictionally fitted Within a groove in the end of said shaft below said disk to hold said disk upon said shaft, and a-folded sheet of emery cloth held rigidly, against the seat of said valve, whereby when said shaft is rotated, said valve head will be ground by said emery cloth.

2. The invention as defined in claim 1, in which the drive stud projections on one side of said disk are more closely spaced than the drive studs on the other side thereof whereby said adapter disk may be inverted and used for grinding a valve head of smaller size.

References (Jited in the file of this patent UNITED STATES PATENTS 1,561,935 Kessler Nov. 17, 1925 1,631,700 Simpson June 7, 1927 1,749,300 Peterson et a1. Mar. 4, 1930 1,867,484 Wolfe et a1. July 12, 1932 1,958,498 r Ryder May 15, 1934 2,400,160 Mizell May 14, 1946 

1. IN A VALVE HEAD GRINDING DEVICE, THE COMBINATION OF AN ADAPTER DISK HAVING A DETACHABLE NON-ROTATABLE CONNECTION TO A VERTICAL POWER DRIVEN SHAFT, SAID DISK HAVING A PAIR OF DRIVE STUDS PROJECTING AT RIGHT ANGLES FROM BOTH SIDES THEREOF FOR DETACHABLY ENGAGING IN THE SHALLOW APERTURES IN THE TOP OF THE VALVE HEAD OF AN INTERNAL COMBUSTION ENGINE, SAID DISK ALSO HAVING A PIN PROJECTING THEREFROM, PARALLEL TO SAID DRIVE STUDS FOR RECEIVING THE LOOP OF A COTTER PIN SECURED TO THE END OF SAID SHAFT ABOVE SAID DISK, AND A U-SHAPED LOCK WASHER FRICTIONALLY FITTED WITH- 